USR Robotics Broadband Router 8003 has a flawed password checking functionality where the password is first verified by a javascript function that has the real administrator password embedded and easily viewable in the source code, allowing any malicious remote attacker to take full control of the device. Tested against firmware v1.04 08. USR Robotics has claimed the problem is not that serious and has not taken any steps to remedy the situation.
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Hello.
US Robotics Broadband Router 8003 is a small home/SOHO router which
is configured using a HTML interface. This interface, as usual, asks for a
password in order to let you view or change configuration parameters. But
the password is checked first by a javascript function that just compares
two strings:
function submitF(F)
{
var loginflag,loginIP;
var pwd;
loginflag = 0;
loginIP = "0.0.0.0";
pwd = "thisistheadminpassword" ;
if (loginflag == 1)
{
alert("Someone ( " + loginIP + " ) has logged in
as an administrator !");
F.submit();
}
if ( F.PSW.value != pwd )
{
alert("Incorrect password!");
F.submit();
}
F.submit();
}
And yes, pwd = "thisistheadminpassword" is actually showing the
administrator password. So anyone who can access the HTML administration
interface will be able to login and view or modify the device configuration.
This is true at least with firmware v1.04 08. The router firmware can be
upgraded but U.S. Robotics has not released any revision for the
8003 model yet.
I have contacted them and they have told me that the problem is not too
serious and that it can be solved by limiting the access to the router
interface to trusted people only. No mention to a firmware upgrade or
any other temporal workaround was made.
Kind regards,
Fernando Sanchez